Correcting Coal Ash Chemistry with Coal Treat Leads to Improved Boiler Operations

1. Is there a relationship between LOI and the amount of chemical additive?

No, we have not seen any relationship to LOI related to the additive dosage in the work we have done.

2. Are there hazardous chemical handling logistics that needed to be implemented with any of the EES’s proprietary additives?

All of the main chemicals that we use; the magnesium, the calcium, the aluminum, the clay-based chemicals are all benign and non-hazardous. If we have to use the copper chemical, it does have some safety concerns with it. We do not use that chemical frequently and we provide the SDS sheet, of course in advance to get that chemical approved.

3. The additives provided by EES, are they in liquid or powder form?

They are liquid slurry that are able to be pumped and applied to the coal. We do not typically use solid based reagents.

4. A question on ash fusion test. What is the detection limits in the ash fusion tests. Are your results within or beyond that limit?

Most of the results that we see are within the limits of the ASTM method. The ash fusion test can only measure up to 2700-degree Fahrenheit. Anything above that would be recorded as 2700 plus. Most of what we look at starts around 1900 to 2100 degrees and then we’re modifying it by 50 to 150 sometimes 200 degrees so we fall within the normal operating range of the test method.

5. Can you selectively treat high load silos only?

Yes, this is something that is coming up frequently with different customers. Depending on the configuration we can dose on tripper car location.  We can take a signal from the tripper car and when it is going to be bunkering over the high load silos that feed the mills that operate at high loads, that would turn the system on only when they are bunkering those particular silos, so that can be done. We only recommend this strategy if those mills are providing good distribution throughout the furnace.